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Updated PitShift to use a single delay line and updated effects.cpp for new RtAudio API.

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This commit is contained in:
garyscavone
2023-08-04 10:14:26 -04:00
parent 8b29e0ea6d
commit 7f97ab5f71
3 changed files with 15 additions and 30 deletions
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11
include/PitShift.h
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@@ -11,7 +11,7 @@ namespace stk {
\brief STK simple pitch shifter effect class.
This class implements a simple pitch shifter
using delay lines.
using a delay line.
by Perry R. Cook and Gary P. Scavone, 1995--2021.
*/
@@ -61,7 +61,7 @@ class PitShift : public Effect
protected:
DelayL delayLine_[2];
DelayL delayLine_;
StkFloat delay_[2];
StkFloat env_[2];
StkFloat rate_;
@@ -83,16 +83,15 @@ inline StkFloat PitShift :: tick( StkFloat input )
while ( delay_[1] < 12 ) delay_[1] += delayLength_;
// Set the new delay line lengths.
delayLine_[0].setDelay( delay_[0] );
delayLine_[1].setDelay( delay_[1] );
delayLine_.setDelay( delay_[0] );
// Calculate a triangular envelope.
env_[1] = fabs( ( delay_[0] - halfLength_ + 12 ) * ( 1.0 / (halfLength_ + 12 ) ) );
env_[0] = 1.0 - env_[1];
// Delay input and apply envelope.
lastFrame_[0] = env_[0] * delayLine_[0].tick( input );
lastFrame_[0] += env_[1] * delayLine_[1].tick( input );
lastFrame_[0] = env_[1] * delayLine_.tapOut( delay_[1] );
lastFrame_[0] = +env_[0] * delayLine_.tick( input );
// Compute effect mix and output.
lastFrame_[0] *= effectMix_;